On September 25, 2012, Microsoft awarded the FreeDOS Project with the Redmond Silver Award, the “ambassadors of the innovative software created by the FreeDOS Project”. FreeDOS is not considered to be a fork of DOS, because it is built on DOS, not a derivative of DOS, and the kernel is distinct from DOS. However, the FreeDOS kernel was based on the code from Project X’s DOS3.3.

On January 31, 2012, Microsoft released the FreeDOS v. 1.0.3 ISO image for the purpose of obtaining a Beta copy of the FreeDOS 2.0 kernel source. The source code used to create the FreeDOS v. 1.0.3 ISO image is not the current FreeDOS 2.0 kernel source.

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References

FreeDOS Wiki
How to install FreeDOS 1.0.4

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What does this integral mean?

What does the following integral mean?
$$\int_0^1 \frac{\arccos(x)}{1+\cos^2x}dx$$
I can’t seem to make progress on this integral.

A:

Using $\cos^2 x + \sin^2 x =1$, the function becomes
$$\int \frac{\arccos x}{1+\cos^2x} dx = \frac12 \int \frac{1-\cos^2 x}{\cos^2 x + \sin^2 x} dx = \frac12 \int \frac{1}{1+\sin^2 x} dx.$$

Paraffin-embedded sections of spleen tissue for immunohistochemical studies: a comparative study.
Although this is a common method for obtaining tissue sections, there is no uniform standardization of the process. The preservation of paraffin-embedded tissue is fundamental for later diagnostic purposes and when this tissue is to be used in research. The purpose of this study was to demonstrate the best technique for obtaining paraffin-embedded sections. Twenty-four spleen samples were submitted for paraffin-embedded sections and a total of 108 immunohistochemical sections (IHC)

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